Since the early 1990s research stream of Intellectual Capital (IC) has been grown, and in the new, knowledge-intensive economies, it has become a source of competitive advantage. Scholars have tried to defined and categorized it, but still literature is not concordant and different methods of IC measurement have been developed. Some authors have emphasized the benefits of qualitative and perceptive measures that catch what the traditional systems have failed to report; furthermore, they are able to describe IC in a prospective approach. Nevertheless, until now, little research has been devoted to analysing IC components and their interconnections and impact (directly or in conjunction) on firm performance. In particular, IC in small and me...